Apparatus for metallizing by the melting and projection of metals



26 1933. M. c. R. HEDDE APPARATUS FOR METALLIZING BY MELTING AND PROJEOTION OF METALS Filed Dec. 5, 1929 2 Sheets-Sheet 1 Fig. 5

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pt. 26, 1933. M. c. R. HEDDE APPARATUS FOR METALLIZING BY THE MELTING AND PROJECTION 0F METALS Filed Dec. 5, 1929 2 Sheets-Sheet 2 /7ar/e C/aude Foyer f/eade Patented Sept. 26, 1933 APPARATUS FOR lWlET GBY TE MELTING AND rnomo'rloor METALS Marie Claude Roger Hedde, Paris, France, as-

signor to the firm La Socit dite: Socit Non velle de Metallisation, Paris, France Application December 5, 1929, Serial No. 411,819, and in France December 7, 1928 4 Claims.

The present invention relates to improvements in apparatus for metallizing by the melting and the projection of metals.

The said invention concerns improvements in" W metallizing pistols, and chiefly in pistols of the Schoop type, comprising a form of construction of a blowpipe having two or more concentric channels for the supply of the compressed air assuring the, projection or spraying of the melted W metal, thus affording a supply of air in one or two steps, at the outlet of the melting chamber, in order to reduce the oxidation of the melted metal and to diminish the risks of back-fire, also affording a better utilization of the apparatus, and a reduced consumption ofgas.

The apparatus comprises a device for feeding the wire which is to be first melted and then projected, including an air turbine actuated by a branch of the compressed air conduit and controlling, by a double worm gearing disposed in a chamber filled with lubricant, milled rollers for feeding out the said wire.

The apparatus further comprises a mixing device situated outside the said pistol and including a central conduit for one of the gases, for instance the oxygen, and a side conduit for the admission of the other gas, also a battle chamber situated in the path of the two gases and thus assuring their intimate mixture, as well as a safety chamber disposed in the path of the gas and having one wall of frangible material adapted to be broken by pressure developed by back-fire to open the cham her to the atmosphere, thus preventing the ignited gases from circulating in the conduits carrying the combustible gases.

The accompanying drawings show by way of example an embodiment of the invention consisting of a Schoop pistol to which the said improvements are applied.

Fig. 1 is an elevation view of one side of the pistol, with a partial axial section of the pistol,

Fig. 2 is an elevation view of the other side of the said pistol, with the cover of the casing of the gas turbine removed,

Fig. 3 is' the corresponding plan view, with the top cover removed,

Fig. 4 is a lengthwise section of-a gas mixing device combined with said pistol and efiecting the mixture before the gases enter the pistol itself,

' Fig. 5 is a sectional detail on a larger scale, of

the cock supplying gas to the pistol,

Fig. 6 is a sectional detail of a safety device preventing back-fire to the conduit for theacetylene gas,

stifi grease, in such manner that the operation (01. ill-12.2)

Fig. '7 is a detail view of the blowpipe shown diagrammatically in Fig. 1.

The blowpipe disposed at the projecting or spraying end of the pistol comprises, as shown chiefly in Fig. 7, an internal nozzle 1, pierced with a central channel 2 for the insertion of the wire of the metal to be sprayed, not shown. Said nozzle is surrounded by an annular gas channel 3, delivering into the combustion and melting chamber 4, the suitable fuel mixture which is supplied through the round orifice 5.

At the outer end of the chamber 4 is the mouth of an annular compressed air supply conduit 6, provided with a circular feeding orifice '7 and connected by apertures 8 with a second annular conduit 9 concentric with the said conduit 6, thus effecting in two. steps, through the said orifices 1(l-11, the delivery of compressed air in contact with the melted metal, thus causing aprogressive action of the air at the outlet of the i5 melting chamber 4. The air supplied in the first place through the annular orifice 10 has a less volume than the air entering through the annular orifice 11. This supply of air in the form of tubular streams will diminish the oxidation of the particles of metal sprayed by the pistol, due to the'less' abrupt cooling of, such'particles after they have been melted. On the other hand, the pistol can be employed without any change in the construction of the blowpipe, irrespectively of the fuel gas in use, in spite of the fact that the usual fuel gases such as acetylene, hydrogen, illuminating gas, or the like, pt- )duce widely varying heats of combustion. This disposition diminishes the risks of back circulation of the gas in the gas supply pipes, and hence the back-fire, also affording a more rational and complete use of the heat produced in the melting chamber, whence a great saving in the consumption of gas.

The gas and air are supplied respectively to the said orifices 5-7 by the conduits l 2-+13 whose flow section is controlled by suitable cock'plugs 14-15 (Fig. 5) which have a combined action and are provided with a single operating handle 16 (Fig. 1)

The cock 14 controlling the admission of the gas is cut outat 17 (Fig. 5). The conduit 13 has a branch 17 controlled by a needle 18 (Figs. 2 and 3) and leading to the casing of a turbine Wheel 19, whose shaft 20 actuates, by means of the worm gearing 21, the milled wheels or rollers feeding out the wire 25 (Figs. 1 and 3). The speed reduction device 21-22 is disposed in a leakless casing 26 which is filled with a lubricant such as of the apparatus will be regular and noiseless, and will have an increased efficiency.

The fuel gas and the oxygenating gas are not mixed in the pistol itself, but this takes place in a mixing device shown in Fig. 4, which com prises a central conduit 2'! for the admission of oxygen and exercising suction in a side tube 28 supplying the fuel gas suchas acetylene, illuminating gas, etc. The mixture, after circulating through the baiiles 29, issues through the nozzle 30 connected to the conduit 31 (Fig. 5) of the regulating cock 14.

When flowing through the baiiie chamber 29, the gas delivered by the conduits 2728 are stirred up and well mingled, thus supplying a homogeneous mixture to the orifice 5 feeding into the blowpfpe. Due to this disposition, the main body of the apparatus comprises only two pipes instead of three, whereby the construction of the apparatus is simplified and a lighter construction afforded.

As observed in Fig. 4, I provide in the path of the gas a safety chamber 32 whereof one wall consists of a leakless but weak disk 33 which is secured by a nut 34, the resistance of said disk being calculated for a given pressure, and in this manner, in the case of back fire, the ignition of the gas in said chamber 32 will only cause the destruction of the said disk, whilst the baflles 29 .will prevent the flame from entering the conduit supplying the fuel gas, so that the gas will burn in the open atmosphere to which access has been given by the said disk 33, due to the lack of compression.

I may also provide in the path of the gas as shown in Fig. 6 a jacket 35 in which is disposed a movable ball 36 mounted in suchmanner that it can be brought by a spring or by gravity upon its seat 37, thus cutting off the tanks containing the acetylene and the oxygen.

If the said ball should be driven by the pressure of the gas against the annular oriflce of the upper conduit 38, the gas may escape through the side conduits 39 of smaller section surrounding the oriflce of the conduit 38.

The said invention is applicable to the Schoop metal coating pistols employed for metallizing of various surfaces, and it is further applicable to analogous devices.

What I claim is:

1. A melting and spraying apparatus for metallic wire, including the combination, with a metallizing pistol, a wire feeding device driven .by an air turbine built into said metallizing pistol and a separate gas mixing device connected to said pistol, of a multiple spraying nozzle on said pistol having at least three concentric nozzle members serially staggered from the innermost to the outermost member and having channels within the same disposed in successively advanced positions with a, combustible gas nozzle and associated channel innermost and the other outer nozzles and associated channels for compressed air projecting successively beyond said gas nozzle in order to provide for primary contact of the burning as with the wire to melt the same and thereafter successive contacts of compressed air jets with the molten metal from said wire.

2. A melting and spraying apparatus for metallic wire, including the combination, with a metallizing pistol, a wire feeding device driven by an air turbine built into said metallizing pistol and a separate gas mixing device connected to said pistol, of a multiple spraying nozzle on said pistol having at least three concentric nozzle members serially staggered from the innermost to the outermost member and having channels within the same disposed in successively advanced positions with a combustible gas nozzle and associated channel innermost and the other outer nozzles and associated channels for compressed air projecting successively beyond said gas nozzle in order to provide for primary contact of the burning gas with the wire to melt the same and thereafter successive contacts of compressed air jets with the molten metal from said wire, there being milled feeding wheels driven by said turbine for feeding the wire to be melted into a flame zone in said nozzle, and means for transmitting the rotation of the turbine to said milled wheels including a complete set of worm gearing encased in a compact grease tight casing and submerged in lubricating grease therein.

3. A melting and spraying apparatus for metallic wire, 'including the combination, with a metallizing pistol, a wire feeding device driven by an air turbine built into said metallizing pistol, of a multiple spraying nozzle on said pistol having a plurality of concentric nozzle members, and a separate gas mixing device connected to said metallizing pistol, comprising a central conduit for one of the gases, a lateral conduit for admission for another gas, bailles arranged in a chamber disposed in the path of the gases in order to mix the latter, and a safety chamber also disposed in the path of the gases and provided with a readily frangible wall which is destructible by return or backfire of a flame from the metallizing pistol.

4. A melting and spraying apparatus for metallic wire, including the combination, with 9. met-- allizing pistol, a wire feeding device driven by an air turbine built into said metallizing pistol, of a multiple spraying nozzle on said pistol having at least three concentric nozzle members serially staggered from the innermost to the outermost member and having channels within the same disposed in successively advanced positions with a combustible-gas nozzle and associated channel innermost and the other outer nozzles and associated channels for compressed air projecting successively beyond said gas nozzle in order .to provide for primary contact of the burning gas with the wire to melt the same and thereafter successive contacts of compressed air Jets with the molten metal from said wire, there being milled feeding wheels driven by said turbine for feeding the wire to be melted into a flame zone in said nozzle, and means for transmitting the rotation of the turbine to said milled wheels including a complete set of worm gearing encased in a compact grease tight casingand submerged in lubricating grease therein.

MARIE CLAUDE ROGER HEDDE. 

